[iOS] Upstream physical web classes.

ios/chrome/common/physical_web/physical_web_types.mm

Index: ios/chrome/common/physical_web/physical_web_types.mm
diff --git a/ios/chrome/common/physical_web/physical_web_types.mm b/ios/chrome/common/physical_web/physical_web_types.mm
new file mode 100644
index 0000000000000000000000000000000000000000..c4b9a1a8d11f1750b4f0ffe01d443c5a9ff9be0d
--- /dev/null
+++ b/ios/chrome/common/physical_web/physical_web_types.mm
@@ -0,0 +1,13 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/chrome/common/physical_web/physical_web_types.h"
+
+namespace physical_web {
+
+NSString* const kPhysicalWebErrorDomain = @"kPhysicalWebErrorDomain";
+
+const double kMaxRank = 1000.0;
+
+}  // namespace physical_web